California earthquakes

M2.8 earthquake 26 km WNW of Three Rocks, California

A magnitude 2.8 earthquake struck 26 km WNW of Three Rocks, California on Fri, Apr 20, 1979, 1:23 AM PST (09:23 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.4 23 km ENE of Soledad, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.8 (md), micro
Local time
UTC
1979-04-20 09:23:36 UTC
Depth
2.8 km (1.7 mi), shallow
Epicenter
36.621° N, 120.654° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 1.0 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
272°, poorly surrounded by stations
Stations used
29

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 52 in the 30 days before it.

After

  1. 2.1Central California · 17329 days ago · 4 km deep · 64 km away
  2. 1.99 km NW of Parkfield, California · 17329 days ago · 8 km deep · 75 km away
  3. 2.022 km NE of Soledad, California · 17329 days ago · 4 km deep · 43 km away
  4. 1.85 km SSW of Tres Pinos, California · 17328 days ago · 4 km deep · 64 km away
  5. 2.515 km SSW of Lockwood, California · 17328 days ago · 13 km deep · 100 km away
  6. 2.224 km NE of Greenfield, California · 17328 days ago · 4 km deep · 39 km away
  7. 1.516 km NW of Parkfield, California · 17328 days ago · 3 km deep · 70 km away
  8. 3.1Central California · 17327 days ago · 8 km deep · 70 km away
  9. 1.54 km S of Ridgemark, California · 17327 days ago · 3 km deep · 66 km away
  10. 2.04 km WNW of San Juan Bautista, California · 17327 days ago · 6 km deep · 87 km away
  11. 1.83 km S of Tres Pinos, California · 17325 days ago · 5 km deep · 62 km away
  12. 2.521 km NE of Soledad, California · 17325 days ago · 6 km deep · 44 km away
  13. 2.321 km NE of Soledad, California · 17325 days ago · 5 km deep · 44 km away
  14. 1.615 km N of Huron, California · 17323 days ago · 4 km deep · 59 km away
  15. 1.84 km SSW of Gilroy, California · 17322 days ago · 6 km deep · 91 km away
  16. 1.622 km NNE of Soledad, California · 17322 days ago · 5 km deep · 49 km away
  17. 2.11 km N of Aromas, California · 17322 days ago · 8 km deep · 93 km away
  18. 2.121 km NE of Soledad, California · 17321 days ago · 7 km deep · 45 km away
  19. 2.55 km NNW of San Juan Bautista, California · 17321 days ago · 7 km deep · 86 km away
  20. 1.712 km SE of Carmel Valley Village, California · 17319 days ago · 8 km deep · 95 km away
  21. 2.319 km NW of Parkfield, California · 17318 days ago · 4 km deep · 67 km away
  22. 1.531 km SW of South Dos Palos, California · 17317 days ago · 3 km deep · 27 km away
  23. 2.524 km ENE of Soledad, California · 17317 days ago · 2 km deep · 39 km away
  24. 1.722 km NNE of Soledad, California · 17316 days ago · 1 km deep · 49 km away
  25. 1.827 km NE of King City, California · 17315 days ago · 5 km deep · 35 km away
  26. 1.617 km SSE of Tres Pinos, California · 17314 days ago · 5 km deep · 54 km away
  27. 2.0Central California · 17313 days ago · 1 km deep · 41 km away
  28. 1.7Central California · 17313 days ago · 7 km deep · 38 km away
  29. 1.623 km ENE of Soledad, California · 17313 days ago · 2 km deep · 41 km away
  30. 1.96 km WSW of Gilroy, California · 17313 days ago · 6 km deep · 96 km away
  31. 1.521 km NE of Soledad, California · 17313 days ago · 7 km deep · 48 km away
  32. 1.6Central California · 17312 days ago · 3 km deep · 64 km away
  33. 1.6Central California · 17312 days ago · 5 km deep · 69 km away
  34. 1.633 km E of Tres Pinos, California · 17311 days ago · 3 km deep · 29 km away
  35. 2.121 km NNE of Soledad, California · 17311 days ago · 8 km deep · 49 km away
  36. 1.614 km ESE of Tres Pinos, California · 17311 days ago · 7 km deep · 48 km away
  37. 2.324 km NNE of King City, California · 17311 days ago · 5 km deep · 38 km away
  38. 2.425 km NE of Greenfield, California · 17311 days ago · 5 km deep · 37 km away
  39. 1.515 km ESE of Tres Pinos, California · 17311 days ago · 8 km deep · 48 km away
  40. 1.730 km SW of South Dos Palos, California · 17310 days ago · 2 km deep · 26 km away
  41. 1.75 km SSW of Tres Pinos, California · 17310 days ago · 7 km deep · 62 km away
  42. 1.911 km S of Tres Pinos, California · 17309 days ago · 4 km deep · 60 km away
  43. 1.97 km E of Gilroy, California · 17309 days ago · 5 km deep · 86 km away
  44. 2.024 km ENE of San Ardo, California · 17309 days ago · 7 km deep · 58 km away
  45. 2.75 km NW of Parkfield, California · 17308 days ago · 6 km deep · 78 km away
  46. 1.616 km SSE of Tres Pinos, California · 17308 days ago · 5 km deep · 55 km away
  47. 3.09 km SE of San Juan Bautista, California · 17308 days ago · 4 km deep · 75 km away
  48. 2.022 km NE of San Ardo, California · 17308 days ago · 6 km deep · 49 km away
  49. 1.625 km NE of Soledad, California · 17307 days ago · 8 km deep · 42 km away
  50. 1.511 km S of Tres Pinos, California · 17307 days ago · 4 km deep · 60 km away
  51. 1.723 km ENE of Soledad, California · 17307 days ago · 6 km deep · 40 km away
  52. 2.125 km WNW of Coalinga, California · 17306 days ago · 6 km deep · 48 km away
  53. 2.226 km WNW of Coalinga, California · 17306 days ago · 2 km deep · 48 km away
  54. 2.025 km WNW of Coalinga, California · 17306 days ago · 5 km deep · 48 km away
  55. 1.825 km WNW of Coalinga, California · 17306 days ago · 6 km deep · 48 km away
  56. 1.925 km WNW of Coalinga, California · 17306 days ago · 6 km deep · 48 km away
  57. 1.82 km S of Hollister, California · 17306 days ago · 5 km deep · 71 km away
  58. 1.69 km S of Tres Pinos, California · 17305 days ago · 2 km deep · 62 km away
  59. 2.110 km WSW of Ridgemark, California · 17305 days ago · 7 km deep · 75 km away
  60. 2.925 km WNW of Coalinga, California · 17305 days ago · 6 km deep · 48 km away

The first 60 of 140.

Before

  1. 3.542km SW of Mendota, CA · 17329 days ago · 6 km deep · 15 km away
  2. 1.922 km NE of Soledad, California · 17330 days ago · 2 km deep · 43 km away
  3. 1.711 km S of Tres Pinos, California · 17330 days ago · 5 km deep · 60 km away
  4. 1.95 km ESE of Aromas, California · 17330 days ago · 5 km deep · 88 km away
  5. 2.822 km NE of Soledad, California · 17330 days ago · 2 km deep · 43 km away
  6. 2.111 km ESE of Coalinga, California · 17331 days ago · 9 km deep · 69 km away
  7. 2.412 km ESE of Coalinga, California · 17331 days ago · 9 km deep · 69 km away
  8. 1.932 km WNW of Three Rocks, California · 17332 days ago · 12 km deep · 7 km away
  9. 1.622 km ENE of San Lucas, California · 17332 days ago · 9 km deep · 45 km away
  10. 1.522 km NE of San Lucas, California · 17332 days ago · 5 km deep · 41 km away
  11. 2.222 km NE of Soledad, California · 17335 days ago · 2 km deep · 43 km away
  12. 1.723 km NE of Soledad, California · 17335 days ago · 8 km deep · 43 km away
  13. 1.924 km NE of King City, California · 17336 days ago · 1 km deep · 37 km away
  14. 2.08 km SW of Tres Pinos, California · 17336 days ago · 2 km deep · 66 km away
  15. 1.723 km ENE of Soledad, California · 17337 days ago · 2 km deep · 41 km away
  16. 1.625 km NE of Greenfield, California · 17337 days ago · 1 km deep · 37 km away
  17. 2.021 km NE of Soledad, California · 17338 days ago · 6 km deep · 44 km away
  18. 1.89 km S of Coalinga, California · 17339 days ago · 9 km deep · 69 km away
  19. 1.722 km WNW of Three Rocks, California · 17339 days ago · 5 km deep · 5 km away
  20. 2.27 km SSE of Coalinga, California · 17339 days ago · 4 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1045482 (also filed as ci3314839). Read Tue, Sep 29, 2026, 2:47 PM UTC.